What figured to be a compelling test for the United States junior national team lost a bit of its intrigue when promising Australia guard Dante Exum was lost with an ankle injury. The Aussies lost their grip on the game soon afterward.

Trailing by 11 when Exum was hurt, Australia went on to be embarrassed by the Americans, 94-51, in a second-round game at the FIBA U19 World Championship in Prague. The U.S. was led by 15 points from Arizona-bound forward Aaron Gordon, 13 from Louisville power forward Montrezl Harrell and 12 from Chicago high school center Jahlil Okafor.

Aaron Gordon has scored in double figures in each of Team USA's first five games. (AP Photo)

Oklahoma State All-American point guard Marcus Smart delivered his best numbers of the tournament: 11 points, 4 assists, 2 steals and only two turnovers. The Americans turned over the ball only eight times as a team, including two in the decisive first half, whereas they squeezed loose 18 steals from Australia with their overwhelming pressure defense.

Of the 12 players on the U.S. roster, 11 scored in the game. Houston high schooler Justise Winslow delivered a double-double with 10 points and 10 rebounds, Washington-bound point guard Nigel Williams-Goss contributed 7 points and 3 assists and Tennessee power forward Jarnell Stokes added 7 points and 5 rebounds.

The U.S. has now won all five of its games in the tournament, by an average score of 100-50.

The team plays its final second-round game Wednesday against Serbia, which also is undefeated through five games. That game will be important for placement in the medal round. The loser will be bracketed with undefeated Spain for a likely semifinal meeting; the winner, however, gets no bargain by being grouped with 4-1 Croatia and star Dario Saric, who is playing in his second U19 championship.

Led by 18 points from Indianapolis high schooler Trey Lyles, Canada won its Tuesday second-round game against Iran, 95-57. Canada also got 12 points from Syracuse-bound guard Tyler Ennis and 13 from Florida State-bound guard Xavier Rathan-Mayes. Canada plays Wednesday against Argentina; the winner will advance to the medal round quarterfinals. The loser will go into the consolation bracket.